Ch 7.3 Using Chemical Formulas. The Mass of a Mole of an Element. Remember: The atomic mass of an element (a single atom) is expressed in atomic mass units (amu). Molar Mass: is the atomic mass of an element expressed in grams/mole (g/mol). Carbon = 12.01 g/mol Hydrogen = 1.01 g/mol
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= 84.01 g/mol
Example: If molar mass of NaCl is 58.44 g/mol, what is the mass of 3.00 mol NaCl?
Mass of NaCl = 3.00 mol x 58.44g =
175 g NaCl
= 101.96 g/mol
1 mol Al2O3
= 964 g Al2O3
Example: If molar mass of Na2SO4 142.05 g/mol, how many moles is 10.0 g of Na2SO4?
Moles of Na2SO4 = 10.0 g x 1 mol =
= 0.0704 mol Na2SO4
= 76.02 g/mol
0.987 mol N2O3
% mass of element= mass of element x100% mass of compound
Mass of compound: 13.60 g
Mass of oxygen: 5.40 g O
Mass of magnesium: 13.60 g - 5.40 g = 8.20 g Mg
% Mg = 8.20 g Mg x 100% =
% O = 5.40 g O x 100% =
1.85 mol N
4.63 mol O